Once again, Agency Republic have done a piece of work for o2 that is so brutally simple, I couldn't help think "I wish I'd come up with that!"

http://www.facebook.com/group.php?gid=2341278532

(If this link doesn't work - just type o2 in the search field on facebook)

This is a great example of a brand infiltrating an existing media channel and delivering a message that is totally relavent to the audience that use that channel.